Patents by Inventor Mitsuharu Iwakura

Mitsuharu Iwakura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for making a composite of vulcanized rubber and a urethane elastomer
    Patent number: 5100704
    Abstract: A method for bonding together rubber vulcanizates and urethane elastomers to form a composite comprising treating an outer surface of the rubber vulcanizate with a first solution of an organic compound containing a ##STR1## linkage dissolved in a solvent where X is a halogen, then coating the treated surface with a second solution of a diphenylmethane diisocyanate-based compound dissolved in a solvent and thereafter casting a urethane elastomer over the coated surface and curing the composite.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: March 31, 1992
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Mitsuharu Iwakura, Kouji Nishibe, Akira Tani
  • Vulcanization accelerator system for rubber compositions
    Patent number: 4026878
    Abstract: Rubber compositions containing therein as a source of carbon disulfide a compound selected from the group consisting of cyclic bis (dithiocarbamic acid) metal salts and cyclic or non-cyclic dithiocarbamic-xanthogenic acid metal salts and an amine-isocyanate addition compound as a vulcanization accelerator system having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.
    Type: Grant
    Filed: October 24, 1975
    Date of Patent: May 31, 1977
    Assignee: The Yokohama Rubber Co. Ltd.
    Inventors: Kunio Kageyama, Hiroshi Hirakawa, Masatake Ozaki, Iwao Sugiyama, Mitsuharu Iwakura, Yoshiaki Someya
  • Vulcanization accelerator system for rubber compositions
    Patent number: 4026877
    Abstract: Rubber compositions containing therein as a source of carbon disulfide at least one compound selected from the group consisting of cyclic bis (thiocarbamoyl) mono- or di-sulfides, cyclic bis (thioxanthogenyl) mono- or di-sulfides, and cyclic (thiocarbamoyl-thioxanthogenyl) mono- or di-sulfides and an amine-isocyanate addition compound as a vulcanization accelerator system having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.
    Type: Grant
    Filed: October 24, 1975
    Date of Patent: May 31, 1977
    Assignee: The Yokohama Rubber Co. Ltd.
    Inventors: Kunio Kageyama, Hiroshi Hirakawa, Masatake Ozaki, Iwao Sugiyama, Mitsuharu Iwakura, Yoshiaki Someya